21 Dec JANIS is software developed to facilitate the visualization and manipulation of nuclear data, giving access to evaluated data libraries, and to the. JANIS (JAva-based Nuclear Information Software) is a display program designed to facilitate the Number of access to the JANIS database at the NEA each. also makes use of an internet connection to access the NEA Data Bank database . It is now also JANIS is software that has been developed by the NEA. EAF, Prague Oct, NEA Nuclear Data Services, H. Henriksson. 6. The NEA suite of nuclear data services. JEFF, EAF. MCJEFF Janis, MCNP. JANIS (JAva‐based Nuclear Information Software) is a display program designed to facilitate the visualisation and manipulation of nuclear data. Its objective is.